Atmospheric neutrino selection
description
Transcript of Atmospheric neutrino selection
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
• goal: improve efficiencies for both E-2 and atmospheric neutrinos
• strategy– improved hitcleaning– track resolution (paraboloid fit)– zenith restricted fit– Phit/Pnohit fit– no neural networks (or similar)
Atmospheric neutrino selection
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Efficiency of New Analysis
• efficiency > 60% above 120°
atmo. neutrinos 45 % E-2 neutrinos 40 %
relative to L2
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Neutrino Candidates
Ndata NatmoMC
θ>90° 2021 1793
θ>110° 1194 1238
NatmoMC: ± 25%
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Effective Area
• zenith angle dependence
newstd.
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Atmospheric Neutrinos
• neutrino-effective area for energies above 50 GeV
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Corrected Zenith Angle Spectrum
• account for acceptance and oscillations
)GeV(
)km()eV(27.1sin2sin1 222
M2
E
LmP
232 eV104.2 m12sin M
2
SuperKamiokande:
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Restrictions on Δm2?
• neutrino flux relative to flux with 232 eV104.2 m
syst
emat
ic e
rror
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
What do we expect from 6 years?
• 10000 atmospheric neutrinos• study high energy• restrictions on alternative oscillation modells
Energy [TeV] < 0.1 0.1 - 0.3 0.3 - 1 1 - 3 3 - 10 >10
Events 900 2800 3200 1900 900 300
% 9 28 32 19 9 3
90% with energies from 0.1 – 10 TeV
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
MedianRes, Zenith (hard cuts z> 110°)
data 00-03 data 2000 data 2001 data 2002 data 2003
... years behave differently number of dead OM‘s is important!
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Lorentz invariance test
case 2: velocity eigenstates = mass eigenstates
case 1: velocity eigenstates = flavor eigenstates
examine 2 extreme cases:
Glashow - hep-ph/0407087
• neutrino species can have different maximal velocities v1, v2, v3 < c• velocity eigenstates rotated w.r.t. flavor eigenstates by v (and phase )
define Ecritical = Ec=sqrt(m²c / 2v)
E < Ec mass oscillation dominant Ec < E Lorentz violation dominant
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
AMANDA‘s range
survival probability for a for case 2 with Ec = 100 GeV
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Case 1: v = 0
hardly accessible for AMANDA
Ec = 1 GeV Ec = 10 GeV Ec = 100 GeV
Ec = 1 TeV Ec = 10 TeV Ec = 100 TeV
Ec = 1 PeV Ec = 10 PeV Ec = 100 PeV
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Case 2: v = /4
Ec = 1 GeV Ec = 10 GeV Ec = 100 GeV
Ec = 1 TeVEc = 10 TeV
Ec = 100 TeV
Ec = 1 PeV Ec = 10 PeV Ec = 100 PeV
well accessible for AMANDA for Ec< 1TeV
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Ec - cos() - plane
cos()
log
( E
c / G
eV )
exclusion regionscase 2:
(only 2002 data,preliminary)
90 % C.L. Ec ~ 102.5 = 316 GeVv/c ~ 1.2*10-26
99 % C.L. Ec ~ 102.2 = 158 GeVv/c ~ 4.6*10-26
Depends on assumed systematic errors (needs to be studied in detail)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Other studies
There are many (exotic) models around that can be tested:
Quantum decoherence extra dimensions
... and lots of other ideas
extensive ANTARES Monte Carlo study
... see Francis talk
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Additional plots (not shown)
Note: analysis 2000-2003 is very preliminary!
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Standard Analysis
Ndata = 470 NatmoMC= 402 ± 100
atmo. neutrinos 11 % E-2 neutrinos 28 %
• optimized for best sensitivity (E-2 – spectrum)• selected neutrinos 2002
• efficiencies
(for θ>90°)
relative to L2
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Efficiency of New Analysis
• efficiency > 60% above 120°
atmo. neutrinos 45 % E-2 neutrinos 40 %
relative to L2
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Neutrino Candidates
New analysis Standard analysis
12381194θ>110°
17932021θ>90°
NatmoMCNdata
312283θ>110°
437459θ>90°
NatmoMCNdata
NatmoMC: ± 25%
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Effective Area
E-2
• zenith angle dependence
newstd.
• energy dependence
new (for different spectra)
std.
new
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Atmospheric Neutrinos
• neutrino-effective area
• remaining background
contribution to systematic error ~10%
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Data 2000-2003
Level 5 data from Zeuthen 00-03 analysis
Level 6a fits with T.Becka‘s hit cleaning
Hard cuts:Ldiff>30 spaceangle(JAMS,phpnh)<10 spaceangle(pandel,phpnh)<100.4 > Smoothness > -0.4 MedianRes<5 „Soccer cut“
Softer cuts:Ldiff>25 spaceangle(JAMS,phpnh)<30 spaceangle(pandel,phpnh)<10Smoothness > -0.4 MedianRes<5 „Soccer cut“
pandel (seeded 32-Pandel)bayes (seeded 64-Bayes)PhPnh (seeded 10-PhPnh) ParabolaFit on PhPnh
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Data 2000-2003
3543319529182309softer cuts
z>90°
1819169014241075hard cuts z>90°
44,98541,37035,46830,955z>90°, flare<10, Irun
1679157413641075softer cuts z>110°
213204193197lifetime
11761138955746hard cuts z>110°
257,874238,475200,159149,404events L6a
2003200220012000year
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
GPS day vs. Zenith (no cuts)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Zenith vs. Cogz (no cuts)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
Zenith vs. Cogz (hard cuts z> 90°)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
MedianRes vs. Cogz (no cuts)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
MedianRes vs. Cogz (hard cuts z> 90°)
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
spaceangle(JAMS,phpnh), spaceangle(pandel,phpnh),Ldiff, Smoothness -- (no cuts)
data 00-03 data 2000 data 2001 data 2002 data 2003
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
spaceangle(JAMS,phpnh), spaceangle(pandel,phpnh),Ldiff, Smoothness -- (softer cuts z> 90°)
data 00-03 data 2000 data 2001 data 2002 data 2003
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
spaceangle(JAMS,phpnh), spaceangle(pandel,phpnh),Ldiff, Smoothness -- (hard cuts z> 90°)
data 00-03 data 2000 data 2001 data 2002 data 2003
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
spaceangle(JAMS,phpnh), spaceangle(pandel,phpnh),Ldiff, Smoothness -- (hard cuts z> 110°)
data 00-03 data 2000 data 2001 data 2002 data 2003
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Jens Ahrens and Thomas Becka, Atmospheric Neutrinos, Berkeley, March 2005
MedianRes, Zenith (hard cuts z> 90°)
data 00-03 data 2000 data 2001 data 2002 data 2003